游离氧化铁

土pH值的大小与粒度成分分维、游离氧化铁含量之间的内在联系，揭示出了红土中游离氧化铁对土颗粒胶结的本质。

The inherence relationship among pH , grain fractal and the content of dissociative iron oxide can open out the essence of cementation in grains of dissociative iron oxide in red soil .

介质pH与膨润值间里正相关关系；有机质和游离氧化铁与膨润值呈负相关；

There was a positive correlation between the swelling value and the pH of medium , and a negative correlation between the swelling value and the amount of organic matter and free ferric oxide .

此外，由于有机质是影响和干扰氧化铁光谱特性的一个重要因子，去除土壤有机质以后，几个研究波段的光谱反射率与游离氧化铁、全Fe、无定形氧化铁的相关系数都有显著的提高。

Furthermore , the correlation coefficients of the spectrum reflectance at the studied wave bands with the content of total iron , free iron oxides , and amorphous iron oxides all increased significantly .

土壤中游离氧化铁铝对提高土壤团聚体稳定性影响也表现显著，但浸泡振荡处理后水稳性团聚体含量的下降大于C-D试剂浸提处理。

Free Fe and Al oxides have a obvious influence on the water stability of soil aggregates , but the decreases of water-stable aggregate contents treating with drenching and vibrating are bigger than that treating with C-D reagent .

红土中游离氧化铁作用的试验研究

Experimental study on function of free iron oxide in red soil

游离氧化铁对红色粘土工程性质的影响

Effect of Free Ferric Oxide on Engineering Properties of Laterite

游离氧化铁与水稻土有机碳的固定密切相关。

The amounts of Fed related to the carbon sequestration in paddy soils .

盐酸羟胺-柠檬酸体系提取土壤中的游离氧化铁

Extraction of Free Iron Oxide from Soil by Hydroxylamine Hydrochloride Citric Acid System

有机质、游离氧化铁、无定形氧化铁、碳酸钙，对Cu~（2+）、Cd~（2+）的吸附特性及其吸附机制的影响。

The adsorption character and mechanism of Cu2 + and Cd2 + on it was investigated .

游离氧化铁的贡献有随颗粒变细贡献增大的趋势。

The free iron oxide contribution had the trend of increasing with the size being smaller .

红壤胶体的比表面较小，当去除游离氧化铁后，表面积特别是外表面积显著减小。

The removal of free iron oxides causes a considerable reduction in specific surface area , especially the external surface area .

除去土壤游离氧化铁和无定形氧化铁后，土壤对磷的吸持容量显著下降。

After removing free Fe oxides and amorphous Fe oxides from the soil , the phosphate sorption capacity of the soil decreases markedly .

所有土样的三个级别有机质和游离氧化铁的贡献值均小于10%。

The contribution values of organic matter and free iron oxide to aggregate stability were less than 10 percent among all the samples .

各粒级微团聚体中的游离氧化铁对Cu~（2+）、Cd~（2+）的吸附也有一定的影响。

The free iron in the soil also present some effects to the adsorption of Ou ~ 2 + and Cd ~ 2 + .

研究发现，游离氧化铁含量和形态的改变，将直接影响红土颗粒的粒度分布。

Research finds that changes of contents and forms of dissociative iron oxide can directly lead the changes of granularity distribution of red soil .

游离氧化铁含量的多少，以及其存在形态的不同都将对红土的工程地质性质产生很大影响。

The content of free iron oxide and how it exists in the soil will bring great influence to engineering geology properties of red soil .

讨论了物理化学因素，特别是结构特征和游离氧化铁的胶结作用，对力学性质的重大影响。

The significant effect of various physicochemical factors , especially the structure characteristics and cementation of free ferric oxide on the mechanical properties is reviewed .

各粒级微团聚体中，游离氧化铁对Cu~（2+）、Cd~（2+）的吸附量随粒级的减小有明显的增加；

The adsorption of Cu ~ 2 + and Cd ~ 2 + increased in the free iron with the decreased of the particle of the microaggregates .

粘粒的游离氧化铁含量，每个山体均是山地黄壤高于山地红壤和山地赤红壤。

The free iron oxide content in clay in every mountain is higher in the mountain yellow soil than that in the mountain latored soil and mountain red soil .

从胶体化学的角度阐明游离氧化铁在红粘土中的赋存状态，指出它们之间的相互作用机理是胶体化学吸附作用；

The paper illuminates the existing state of free iron oxide in red clay in the view of collochemistry , pointing out the interaction mechanism between them is the adsorption of collochemistry ;

从吸附机制来看，去除游离氧化铁以后，棕壤各粒级微团聚体对Cu~（2+）、Cd~（2+）的静电吸附能力有所上升，络合吸附能力有所下降，未知吸附能力也有所下降。

To the adsorption mechanism , after dissecting the free iron , the exchange ability of Cu ~ 2 + and Cd ~ 2 + increased , the complexation ability decreased , the complexation ability also decreased .

本文通过模拟环境中的有机质使游离氧化铁形态转化对典型红粘土工程性质的影响试验，系统地测试了游离氧化铁的形态分布与物性指标的关系。

In this paper , by simulating the form conversion of free iron oxide caused by the organic matter in environment , the relationship between free oxide status distribution and physical index is systemically measured and discussed .

在游离氧化铁胶结作用下，其性质十分稳定，结合水不容易从红色黏土中脱出，并且其厚度只有几层水分子构成。

In the role of free iron oxide , it is very stable in nature . Adsorbed water is not easy to break away from the red clay and the thickness is several layers of water molecules only .

且对土体中的游离氧化铁含量的测定也表明，粉煤灰的加入使土体中的游离氧化铁含量增加，也证明了氧化铁对土体的加固作用。

The measurement of the free ferric oxide content in the soil also indicated that the addition of fly ash into the soil foundation increased the free ferric oxide content , which too , verified the strengthening function of ferric oxide .

成土条件的不同，造成了三种纳米颗粒中游离氧化铁的含量及氧化铁结晶形态的区别，可能是影响吸附能力的主要因素。

The adsorption of Cd was possibly related not only to content of the free iron oxides , but also to crystalline type of the oxides in the nanoparticles , which were decided by the different formation process among the three soils .

土壤去除有机质后，对稀土的吸附量下降约7.6%；去游离氧化铁后，稀土元素的吸附量增长7.4%左右。

While pH value increasing , the adsorption amount increased , especially at pH 5.0-6.0 . The REE adsorption decreased about 7.6 % when organic matter of soil was erased , but it increased about 7.4 % when movable Fe-oxides of soil were erased .

采用多元线性回归统计法和BP神经网络法分别建立了预测土壤有机质含量和土壤游离态氧化铁含量的多元回归模型、BP神经网络模型。

The models of multivariate linear regression and BP neural network were established in order to predict their content of soil organic matter and free ferric oxide .

以光谱反射率（反射率倒数，反射率对数，反射率一阶微分等）作为自变量，有机质和游离态氧化铁作为因变量，运用多元线性回归、BP神经网络方法建立数学模型。

Mathematical models were built among spectral reflectance as independent variables and organic matter and ferric oxide as the dependent variable by multivariate linear regression and BP neural network .